1387641533 has 2 divisors, whose sum is σ = 1387641534. Its totient is φ = 1387641532.

The previous prime is 1387641511. The next prime is 1387641539. The reversal of 1387641533 is 3351467831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883100089 + 504541444 = 29717^2 + 22462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387641533 - 2¹² = 1387637437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387641539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693820766 + 693820767.

It is an arithmetic number, because the mean of its divisors is an integer number (693820767).

Almost surely, 2^1387641533 is an apocalyptic number.

It is an amenable number.

1387641533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387641533 is an equidigital number, since it uses as much as digits as its factorization.

1387641533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The square root of 1387641533 is about 37251.0608305321. The cubic root of 1387641533 is about 1115.3874749768.

The spelling of 1387641533 in words is "one billion, three hundred eighty-seven million, six hundred forty-one thousand, five hundred thirty-three".